How would you feel if you knew your work started being used by authoritarian regimes to oppress their citizens speech and ability to organize?
How confident are you that Facebook wouldn't take that opportunity if it was presented to them? Same question, but what if FB's user numbers and usage have declined for a couple years and they are desperately trying to monetize any lingering network effects they can?
They currently have a friendly panopticon. Only the morals of their leadership and PR concerns are holding them back from changing the friendliness.